Shiftable type organization for typewriting machines



Feb. 27,, 11951 c. w. NORTON ET AL 2,543,124

SHI FTABLE TYPE ORGANIZATION FOR TYPEWRITING MACHINES Original FiledAug. 10, 1946 7 Sheets-rS heet 1 INVENTORS (WARL ES W. NORTON dno JOHNH. R/TZ HEIR ATTORNEYS Feb. 27,. 1951 c. w. NORTON ET AL 2,543,124

SHIFTABLE TYPE ORGANIZATION FOR TYPEWRITING MACHINES Original'Filed Aug.10, 1946 7 Sheets-Sheet 2 INVENTORS CHARLES H. Noam/v BY and JOHN R/rz ITHEIR ATTORNEYS FIG 4 Ii? 1951 c. w. NORTON ET AL 5 3 SHIFTABLE TYPEORGANIZATION FOR TYPEWRITING MACHINES Original Filed Aug; 10, 1946 7Sheets-Sheet 3 wqqw \i iii .54

l VENTORS F I G 4 L55 W. IVORTO/V BY JOHN H. R 172 THEIR ATTORNEYS Feb.27 1951 c. w. NORTON ET AL 2,543,124

SHIFTABLE TYPE ORGANIZATION FOR TYPEWRITING MACHINES 7 Sheets-Sheet 4Original Filed Aug. 10, 1946 "'HHIIIHIII.

/2 INVENTORS CHARLES M NORTON ano JOHN/l. R/Tz MIM+ m HEIR ATTORNEYS1951 c. w. NORTON ET AL 2,543,124

SHIFTABLE TYPE ORGANIZATION FOR TYPEWRITING MACHINES Original Filed Aug.10, 1946 7 Sheets-Sheet 5 F l G 9 INVENTORS CHARLES AA 0,9704 BY d'noJay/v R/Tz M @VHM HEIR ATTORNEYS Feb. 27, 1951 c. w. NORTON ET AL2,543,124

SHIFTABLE TYPE ORGANIZATION FOR TYPEWRITING MACHINES Original Filed Aug.10, 1946 '7 Sheets-Sheet 6 INVENTO CHARL E5 H. To

and Joy/v R1 TZ EIR ATTORNEYS Feb. 27, 1951 c. w. NORTON ET AL SHIFTABLETYPE ORGANIZATION FOR TYPEWRITING MACHINES 7 Sheets-Sheet '7 OriginalFiled Aug. 10, 1946 FIG.I2

FIG.|3

INVENTORS CHARLES IV Noam/v BYd/hfi JOHN H. R/Tz W MYMI T EIR ATTORNEYSPatented Feb. 27, 1951 SHIFTABLEJTYPE ORGANIZATION. FOR: TYPEWR ITINGMACHINES.

Gharles W. Norton, West Orange, N. J., ami'Jchm H. Ritz, Huntington, N.Y'., assignorsto Ralph. C. Cox-head; Corporation, New York; N; Y a.

corporation of Delaware Original application August. 10, 19.46,SeriatNo".

689,754; Divided'and this application April 11-, 1947', Serial No.740,878

(Ci. LBW-49)- 14 Claims.

This, invention; relates toztypewriting' machines of the kind known invthetrade as the Vari typer, in, which: an embossed type shuttle. ismoved about a circular anvil to present selected type at a commonprinting point.

This; application is a divisionv of oopending: application SerialNo.689,754, filedAugust 1.0; 194.6, and has reference to mechanism: wherebytwo type shuttles are mounted ona oirculan anvil, either shuttle beingmovable intozoperative position-by the operationof a shift key.

In the form shown, the presentinvention. is incorporated ina'rnachine-for typing messages in generally linear symbolsof: varyinglengths, such as dot-andedashsymbols of. the teiegraphio code; the typemessagesbeing primarily intendedito be used. in the transmission of suchmessages.

The printing type is embossed upon. a pair of shuttles which are movableas above described; a pigment ribbon being passed'between theshuttle andthe material to be printedupon, anchthe material beingforcedagainst theribbon and type by a stroke from the printing hammer. A strip of papertape or other material is fed upward past the printing point of themachine; the printed message being deliveredas a continuous tape.

In the form of shuttle herein disclosed; there is a single rowoff'typesymbolsembossed upon the surface of the shuttle, the shift: keyserving to bring a difierentashuttie into-positionat the printing pointrather thanhaving; a: doublerow of typesymbols embossed onthe shuttlean.d=pr0=- viding for registering the second row of symbols with theprintingpoint by. ope-rationbf the shift key. This constrnctionis usedhereinipartly-because some of the code symbolsxextend for.aaconsiderable length; However, a. greater: selection of fonts oftypecould be secured in conventional type-symbois by employing themechanism disclosed, eaclrshuttie being displaoeable alongitssaxis'toiregistei: any. of a pluraiityof of type. with the printingpoint.

It; is an object of the invention to adapt aat writermeohaniszn of, theVarityper type; so:- as to mount a plurality of type-carrying: shuttleswhich are; selectively moved into. positiontai Further objects and;objects relating; to. detailsand"economieswofaconstructionandaoperationwill more-definitely appearfrom the-detailed description; which; follows.

Our, invention. is clearlydefined in the. appended'claimsr. Intheclaims;as well as: in the description, parts; are at times. identified by,speoific names for. clarity: oonvenienoe; but such nomenclature is tobe." understood; as having; the broadest meaning consistent with. theecontext and with the concept of? our: invention as distinguished fromthe pertinent: prior art}. The best: form iniwhichwe; have-contemplatedapply.- ing'our invention is illustratedinrthesaocompanye ing' drawingsforming: part of: thisfspeoification; in which:

Fig. 1 is atop plan view or the? code: writing machine; parts beingomittedi and; other parts broken away to show: the'genera'l' arrangementof the operating parts.

Fig. 21s a plan; and horizontal; seotionalview of the typewriter.

Fig. 3 is a verticalsection through; the; type:- seleoting device, takenin genera1:1ine'23'-3 of Fig. 1.

Fig; sisa schematic View of theikeyb'oarch Fig. 5* is an elevation ofthe shuttleshifting mechanism VieWed from the lefn-sidaoi Figa' l;partly'in section taken generallyronz line 5.-5: of Fig. 11', with partsomitted andiother:partssec tioned for clear-mess of illustration.

Fig. 6 is an elevation and section: taken gen:- erally on line 6-4)" ofFig: 5 of the mechanism shown in Fig. 5 viewed from the front oil Fig.1', showing parts omittedfrom Fig. 5.

Fig. '7 is a view similar to Fig. 5but showing parts thereof in adifierentoperating position.

Fig. 8 is an elevational" View of the shuttleshifting yoke showrrin planin Fig; 11.

Fig. 9 is a-sectional view of the shuttle-shifting yoke taken in generalon line -9-9 of Fig.- 8; showing the pivotal connection. of the.shifting pinion to the yoke, andshowing in dot-and-dash lines thepinionpositioned inithegyokc.

Fig. 1.0 is; a: detail plan view" of; mechanismzfor operating theshifting pinion.

Fig. 11 is a-similar view-of the parts shownin Fig. 10 and related partsoperated thereby, in a different operating position.

Fig. 12-is'a detailed e1evationa1view-from=the rear of themachineshowing-theshuttleand type locking device whereby the typeislocked at the printing point during the printing operation.

Fig. 13 v is a; detailedsectionalview" ofthe type lockingdevicetaken'bnthe line l'3-Y-I3of- Fig. 12.

This typewriting machine, which is adapted for the typing of charactersof varying lengths such as telegraphic code messages which do notrequire capitalization and some other characters of ordinary printing,has thirty keys arranged in three banks of ten keys each. Eleven ofthese keys are utilized by means of shift keys for the typing ofadditional symbols.

The arrangement of the keyboard is shown diagrammatically in Fig. 4. Thekey levers are arranged in two groups, on opposite sides of the centerof the machine, and are pivoted on an arcuate pivot bar 2 which issecured in the frame I (see Figs. 1, 2 and 3). The rear ends 5 of thekey levers pass under and beyond a universal bar 6, hereinafterdescribed. There are two universal bars 6, one overlying the key leverson each side of the center of the machine.

Inasmuch as the structure of the universal bars 6 and connectingmechanism is similar, a description of one is sufficient, it beingunderstood that each acts through intermediate mechanism to move a typeshuttle I5 or I5 to the right or left relative to the printing point, atwhich the midpoint of the shuttle normally stands. The universal bar 6(see Fig. 3) comprises a bail-like frame pivoted on a shaft secured in astationary bracket 8. An upstanding arm 9 is rigidly secured to the bar6 and acts upon a shuttle arm It to oscillate it about a shaft I2 andposition the type shuttle I 5 or I5 so that the symbol corresponding tothe depressed key will be brought to the printing point for reception ofthe printing hammer stroke, as hereinafter described. Theabove-described mechanism in arrangement is in general the same as thatdisclosed in the patent to Trego No. 1,967,273 of July 24, 1934, towhich reference is made for a more detailed description of thisconventional arrangement.

While the mechanism for type selection is in general similar to that ofthe above-mentioned patent to Trego, the shuttle arm Ill has a modifiedmounting in the machine which permits ready disengagement from itsconnection with either of the type shuttles I5 and I5. The two typeshuttles I5 and I5 are mounted on a stationary circular anvil I4supported by a fixed shaft or column I2. The column I2 rotatably mountsa sleeve II which constitutes the pivot for oscillation of the arm I0.not only oscillated on the shaft I2, but also reciprocated thereon bymeans of a lug or flange II. The sleeve II passes through an aperture I9in the main frame I, which aperture has an internal circumferentialgroove (not shown) to permit the flange I I to be oscillated by the axisof the shaft I2. The aperture I9 also has an axial groove on one side topermit the flange II to be reciprocated. The purpose of thismodification of the type selection mechanism will be apparent from thefollowing description.

Key shift mechanism The typing of telegraphic code symbols of thedot-and-dash character requires that the vari ous symbols be of lengthscorresponding to the groups of dots and dashes which compose them. Theyhave, therefore, various lengths not reducible to the uniform letterspacing of ordinary typewriting machines. When embodying such type in amachine using a type shuttle, it has been found expedient to space thetype at equal angular distances on the shuttle, as is usual in theVarityper, and to arrange the normally longitudinal dimension of thetype along verti- The sleeve II is cal lines. This construction makes itimpracticable to accomplish the function of shift keys by raising orlowering the shuttle axially, as heretofore, to bring a different typecase into position. Instead of raising or lowering the type shuttle asin the usual Varityper, first and second type shuttles I5 and I5 aremade use of, which are shifted horizontally around the anvil I4, therebyremoving one shuttle from the printing point and substituting the othertherefor; which shifting of shuttles is accomplished through theoperation of the usual shift keys.

Referring to Fig. 1, it will be seen that the shift keys 22 are providedwith key levers 24, which are loosely supported on a rock shaft 25,mounted for oscillation in the sides of main frame I. The shift keylevers 24 are limited in their downward movement by stop screws 26, andoscillate the shaft 25 by means of arms 2'! projecting from said shaft,each arm 21 having an engaging portion 28 extending under the shift keylevers 24 so that depression of the key lever 24 oscillates the shaft25. The shaft 25 also has an arm 29 projecting therefrom at the leftside of the machine and connected with a mechanism for shifting theshuttles about the anvil I4 (see Figs. 1 and 2). The arm 29 is pivotallconnected by means of a link 3| (see Fig. 2) to an arm 32 projectingfrom a vertical rock shaft 34, which has a driving element forinterchanging the first and second shuttles I5 and I5 about the anvilI4. A conventional shift lock 35 may be used, if desired, to hold theleft-hand shift key lever in its depressed position, thereby holding theentire shuttle-shifting mechanism in the position to which it has beenmoved by depression of the shift key lever 24.

The shuttles I5 and I5 (see Fig. 5), having respective fins I6 and I6projecting from the back thereof, are positioned on the periphery of theanvil I4 with the fins lying in a circumferential slot I! in anvil I4.Both of the shuttles have, on their bottom edges, engaging means such asthe lugs 35, 35 projecting downwardly. The

, shuttle I5 carries on its outer face the printing type for all symbolsto be printed normally; that is, when the shift keys are not being used.The second shuttle I5 carries type for symbols to be printed when theshift keys are depressed.

A yoke 36 which may be formed of sheet metal (shown in Figs. 5, 7, 8 and11) is provided for cooperation with the shuttles to accomplish theshifting operation. The yoke B is an arcuate member, preferably ofsubstantially 180 in extent, and is of such radius as to conform to theperiphery of the circular anvil I4, about the cen ter of which itoscillates. An arm 3! (see Fig. 11) of the yoke 36 extends parallel toand spaced slightly from the middle radius of the yoke 36 and has at oneside an enlarged rounded portion 38 concentric With the yoke. Theenlarged portion 38 has an elongated opening to therein at the center ofthe yoke 36. The longer diameter of the opening coincides with the linejoining the extremities of the yoke 35, and the shorter diameter isperpendicular thereto, passing through the center of the yoke.Upstanding lugs 4| project from the edge of the opening 48 at theterminals of the shorter diameter and are apertured for the reception ofpivotpins42,42. The arm 37 is offset from the plane of the yoke 36 by anangular portion 44 so that the axes of pins 42,42 coincide and lie inthe plane of the upper surface of the yoke 36 (see Figs. 8 and 9). Thearm 3'! has an extension 43 projecting beyond accesses the enlargedportion A pinion #8 -:,(see Figs.

a6 and 279 .is mounted :in M of the yoke 36 by means =If the pins 52,242and has a central 'bore for the-reception .oi the shaft 212 upon whichit is adapted :to oscillate rand reciprocate, thereby oscillating andreciprocating the yoke ,36. The yoke :36 is provided withtonguesd'! and#41 which extend inwardly :and upwardly *(see Figs. -5 and Projections:45 and 45' are :formed at the .ends of the yoke ;3 6., :extendioutward,and have suitable means g-ior engaging the shuttles .15 and l5'.,;;suoh;as aperturesllfi and 46, to receive lugs -35-1and .35 on the :bottomedges of shuttles i5 and 15. .As

shown in Fig. 5, the projection 45 :is iinrengagement with the lug 35 ofshuttle 15",, Whichdtlg ex- "tends into the aperture 4'6, while theprojection 45 'is shown disengaged from the lug 35, .the yoke having :aslightly tilted iposition relative to anvil I4. lug 3.5 of the secondshuttle '|15';S6IV6S :to -reta.i'n that shuttle in :the fixedpositionon-anvil :M, while the first shuttle I5 is free to bemovedashout the anvil 14 within a limited arcuate range under control ofthe key levers .24 and the ,shuttle arm ill to bring the selected typetothe printing point. Thus, the shuttle I5, in its normal position, isfree to be moved to the right and left about the axis of the anvil :14while the shuttle i5 is immovably locked'inposition by the en a ementofthe yoke 36-withathe shuttle I 5'.

The pinion 418,, which is connected to the yoke .35, can oscillate :only:within the limitation imposed by that yoke, 180 in the :form shown. To

produce that oscillation, a'segmentsleeveifl (Fig. I

-6) is iournaledon a stub shaft 5| .secured in the underside of a fixedcross arm .18, and --,carries a segment gear 52, which meshes with thepinion 38. As shown inFigs. l and =ll, acam f rk 5.6 projects from thesleeve :50 serving as the Operating-arm therefor.

The yoke 36 is retained ,in engagement with the shuttle i and out ofengagement with the shuttle 5 when in the normal position .by meansEngagement .of the projection 45 with the 520 of a resilient springplate 10 (see Fig. ,5) which is pivoted by pin H on an axis parallelwith the cross arm 58. Thespring plate 1!! has a .fork bracket 12secured to the underside thereof and adapted to engage either of thetongues 41 or M of the yoke I36 when positioned adjacent a fork 14 atthe extremity of the bracket. When the yoke 35 is in the .position shownin Fig. 5;.the pressure of the spring .l-B against the bracket l2 biasesfork .(4 and tongue 41' upwardly, thereis by tilting the yoke 36 andholding it in contact with the anvil M adjacent the shuttle l5". Inorder .to remove the shuttle i 5' from the anvil M, the yoke adjacentlug 35' may be depressed by a downward pressure on the spring plate '10,thereby freeing shuttle L5, -Simila1'ly, the shuttle i5 may he removedafter actuationof the shift lock.3.0.

When the projection 45 isre'tained in engagement with the shuttle i5,asfin the normal typ- In order to maintain the shuttle in nors'imalzoperating vposition,.a spring :biasesthe'arm 32 to the deft :asviewed in iE'ig. i5, which Ibiases the chatted thedirectionzoftheiarrow, clockwise when viewed from the top. The :shafit as, in turn,biases .a projecting member :81, which is radial to shaft .34, ito theright end :of ethe cam slot 82 in an arm 83 of thelbellcrankilevercomposed 'of the arm 83, a pivot .shaft 581! .and .anarm B-l. The-arms83 and 8 are rigidly secured to :the shorten which is journaled sinbearings BE in 'a bracket 86 secured to -a projection 154 :of thestationary cross arm 53. l he conformation of the arm 83 GFig. -11=) issuch that the portion thereof containing the cam slot 82 is curved in anarc concentric with the axis of vertical rock shaft 34. The arm 13 has aforked end 88 enaging the'iug M at the "lower end of sleeve i'lil.*Thus, the tension of the spring to operates to draw and hold theshuttle arm to downward into engagementsvith the'fin l-fiof thetypes-huttle 15. this position, depression of a type key-operates in theusual way to oscillate the type shuttle I 5 and bring *the selected"type to the printing point, theryoke 36 oiferingno hindrance to-suchmovement.

"ff it is :desired to type a symbol positioned on the second shuttle1,5", which requires operation of the shift key, that operation, actingthrough the arm '29 will draw the link 3! to the rig-ht as viewed inFig. ,5 (forward as viewed in' Fig. 10), thereby oscillating the shaft134 in-a counterclockwise direction againstthe'bias of the spring 80 andturning the member '81 in asimilar direction. This :movement of themember '8'! (see Fig. "7'), acting in the cam slot '82, raises the arm83, thereby raising the arm 18'! of 'the'bellcrank lever and the sleeve"I"! by means of the fork i813 and the lug Iii. By this :motion, thesleeve '1'! not only lifts shuttle arm ill out of engagement with theopening "in the fin 1.6 of shuttle in, :but the sleeve ll contacts thepinion "48, lifting the pinion and the lugs 4] 'to lift the yoke 36."Since the yoke is already in contact with the anvil Hi adjacent theprojection d5", it can rise no higher at that pointbut the remainder ofyoke es W111 be raised to a horizontal position in which the projectionis in engagement with the lug 3'5 of theshu'ttle 1'5 adjacent theprinting point, which slug .then extends through the aperture 456.

At the same time that the shuttle arm 19 is lifted out .of engagementwith the fin it of the shuttle 15, the opposite .end is of that arm islifted into-engagement with aiforkefl on the upper end .of .a detent .91secured on the projection .54, thereby accurately positioning .andholding the arm it against rotary movement during transposition of .theshuttles. As :the member 8! enters .the horizontal portion of the camslot 82, the .s'huttlezarm it is held stationary by the interengagement.of the fork .98 with the end it! of the .arm 1.0. The member it! maycontinue to .move the horizontal portion of .the cam slot 432 withoutproducing any .further upward movethe rock shaft 34. When the member"31, by its movement, has freed the shuttle 15 from the shuttle arm land connected the yoke 36 with both of the shuttles l and. E5, thevertical portion of arm 89 enters the notch 59 in the cam fork 55,during which time further movement of the member 5| in the horizontalportion of the cam slot 82 is an idling movement.

Upon further movement of the arm 89 in a counterclockwise direction, thevertical portion of that arm enters the notch 59 and contacts the sidesof that notch to oscillate the segment sleeve 58 and the segment gear 52in a clockwise direction. This movement oscillates the pinion 48 in acounterclockwise direction, oscillating the yoke 33 and the shuttles l5and [5' therewith until the arm 3'! of the yoke 36 contacts the oppositeside of the stub shaft 5| and the arm 89 passes into contact with thecurved surface 58 of the cam fork 56, which surface has now becomeconcentric with the rock shaft 34.

During this movement of the yoke 36 through 180, it has been held inclose proximity with the anvil Hi by means of the arm 83, the arm 81',the fork 88, and the pinion 48, so that the shuttles l5 and [5 have beencontinuously engaged by the projections and and shifted to diametricallyopposite sides of the anvil 14, thereby interchanging their positionsrelative to the printing point. Further movement of the arm 89 causes nochange in the angular position of the yoke 35, but securely locks it inposition while passing idly over the curved surface 58. Member 8i,engaging the inclined portion of the cam slot 82, depresses the arm 83and, through the intermediate action heretofore described, lowers thesleeve H, thereby engaging the shuttle arm ill with the aperture in fin[6 of the second shuttle l5 and lowering the yoke 3E5, therebydisengaging projection 45 from shuttle l5 and leaving it free to beoscillated by the shuttle arm E G in the typing operation.

To insure accurate positioning of the type characters on the messagetape, it is desirable that the type be mechanically positioned and heldimmovable at the instant the printing hammer strikes to make theimpression. Accordingly, a notch 92 (see Figs. 12 and 13) is provided inthe lower edge of the printing shuttles l5 and [5' corresponding to eachsymbol. A type lock 94 has an upturned portion 95 with an edge or point85 extending upwardly through the aperture 46 (or 45) in the yoke 36 toenter the appropriate notch 92 at the printing point after selection ofthe proper symbol, thereby immovably locking the type shuttle I5 or I5in position at the instant of printing. This type lock is actuated intolocking position upon release of the printing hammer to form the typeimpression.

The paper tape is fed upwardly past the printing point 9? and a pigmentribbon is progressed past the printing point and between the tape andthe shuttle [5 or [5. A hammer, which is released by actuation of any ofthe printing keys 3, strikes the back of the tape and drives it againstthe ribbon and the shuttle to form-the printed impression.

The herein-described typewriter progresses the tape past the printingpoint varying amounts, depending on the space required by the particularsymbol printed. The space requirement of a symbol printed when a shiftkey 22 is depressed may be different from that of the symbol printed bythe same key 3 when the shuttle I5 is in normal position. Hence, means,more particularly described in the above-mentioned parent application,is provided and actuated by operation of a shift key 22 for varying thespacing action taking place upon depression of a printing key 3.

An understanding of the details of operation of the balance of themachine, which is completely set forth in the parent application, abovementioned, is not necessary for a complete understanding of the actionof the shuttle shifting mechanism, above described.

It is to be understood that while the invention is described herein asapplicable to a typewriting machine of a kind known as Varityper, it iscapable in its broader aspects of use with other kinds of typewritingmachines and is to be understood as limited in its scope only asindicated in the appended claims. Further, While in the descriptionreference has been made to use of this machine for typing ofdot-and-dash symbols of the telegraphic code, it is equally applicablefor the typing of any symbols of varying lengths, and certain featuresof the invention are equally applicable to typewriters generally.

We claim:

1. In a typewriting machine, the combination of an anvil having acylindrical surface, a type shuttle slidably mounted on said surface formovement relative to a common printing point, means for indexing saidshuttle to present characters at the printing point, a second shuttleslidably mounted on said surface circumferentially of thefirst-mentioned shuttle, means normally to retain said second shuttle infixed position, and a shift key and associated mechanism operatedthereby for transpcsing said shuttles.

2. In a typewriting machine having a keyboard, the combination of afixed anvil having an arcuate surface, a type shuttle slidably mountedon said surface for oscillatory movement past a common printing point,means for indexing said shuttle to present characters at the printingpoint, a second shuttle slidably mounted on said surfacecircumferentially of the first-mentioned type shuttle, means normally toretain said second shuttle in fixed position, and means operable fromthe typewriter keyboard to transpose said shuttles.

3. In a typewritin machine, the combination of a fixed circular anvilhaving a cylindrical sur face, a first type shuttle slidably mounted onsaid surface for movement relative to a common printing point, means forindexing said shuttle to present characters at the printing point, asecond shuttle slidably mounted on said surface circumferentially of thefirst type shuttle, means normally to retain said second shuttle infixed position, and a shift key and associated mechanism for removingthe first type shuttle from the printing point and substituting thesecond type shuttle therefor.

4. In a typewriting machine, the combination of a fixed circular anvilhaving a cylindrical surface, a type shuttle slidably mounted on saidsurface for movement relative to a common printing point, means forinder'ng said shuttle to present characters at the printing point, asecond shuttle slidably mounted on said surface circumferentially of thefirst-mentioned shuttle,

eans normally to retain said second shuttle in fixed position, and ashift key and associated mechanism for disengaging said shuttle indexingmeans and said shuttle retaining means, transposing said shuttles, andreengagin said shuttle-indexing means and said retaining means, thefirst shuttle becoming fixed and the second assures shuttle :becomingunder .jcontrol :of said shuttle indexing means.

SJ In a typewriting machine, the combination of a fixedanvil.havingcacylindrical surface, a type shuttle slidably mounted. onsaid anvil surface for oscillatory movement past a common printingpoint, means for indexing said shuttle to present characters at theprinting point, a second type shuttle slidably mounted on said surfacecircumferentially of the first-mentioned shuttle, -means normally toretain said second shuttle in fixed position, means operative from thetypewriter keyboard for disengagingthe shut tles from the indexing meansand retaining means, transposing said-shuttles and reengaging theshuttles with the indexing means and retaining means, the first shuttlebecoming fixed and the second shuttle becoming under control of saidshuttle indexing means, and means for locking the shuttle indexing meansagainst in dexing movement during transposition of the shuttles.

6. In a typewriting machine, the combination of a fixed anvil having acylindrical surface, a first type shuttle slidably mounted on said anvilsurface for oscillatory movement past a common printin point, means forindexing said shuttle to present characters at the printing point, asecond type shuttle slidably mounted on said sur face circumferentiallyof the first type shuttle, means normally to retain said second shuttlein fixed position, means operative from the type writer keyboard fordisengaging the shuttles from the indexing means and retaining means,removing the first shuttle from the printing point and substituting thesecond shuttle therefor and reengaging the shuttles with the indexingmeans and retaining means, the first shuttle becoming fixed and thesecond shuttle becoming under con" trol of said shuttle indexing means,and means for locking the shuttle indexing means against indexingmovement during transposition of the shuttles. v

'7. In a typewriting machine, the combination of a fixed anvil having acylindrical surface, a type shuttle slidably mounted on said surfac foroscillatory movement past a common printing point, means for indexingsaid shuttle to present characters at the printing point, a second typeshuttle slidably mounted on said surface circumferentially of thefirst-mentioned shuttle, means normally to retain said second shuttle infixed position, means operative from the typewriter keyboard fordisengaging the shuttle indexing means and shuttle retaining means,transposing said shuttles and reengaging the shuttle indexing means andshuttle retaining means, the first shuttle becoming fixed and the secondshuttle becoming under control of said shuttle indexing means, and meansfor locking the shuttle indexing means against indexing movement duringtransposition of the shuttles.

8. In a typewriting machine, the combination of an anvil having acylindrical surface, a type shuttle slidably mounted on said surface formovement relative to a printing point, an indexing arm to index saidshuttle for selectively presenting characters at the printing point, asecond shuttle slidably mounted on said surface, a shuttle transposingmember engageable simultaneously with both of said shuttles, and meansoperable from the typewriter keyboard for oscillating said member so asto transpose said shuttles and restoring said member to return theshuttles to normal position.

*9.'In a typewritingrmachine, the combination ofan'anvil'havingacylindrical surface, a type shuttle slidably mounted onsaid surface for movement relative to a printing point, an indexing ,armto index said shuttle for selectively presenting characters at theprinting point, a second shuttleislidably mounted on said surface, ashuttletransposing member pivotaliy mounted for:oscillation-on the axisof said'anvil surface and engageable: simultaneously withbo'th of saidshuttles, and means operable from the typewriter keyboard ffOIoscillating said member throug'han angle :ofsubstantially 188 so'as-totranspose: said shuttles and restoring said member ,to returntheshuttles to normal position.

-10. In a typewriting machine, the combination of alfixed anvil :havinga cylindrical surface, a type shuttle slidably mounted on said surfacefor oscillatory movement past a common printing point, means forindexing said shuttle to present characters at the printing point, asecond type shuttle slidably mounted on said anvil surface, a membermounted beneath said shuttles, and means for raising said member intoengagement with said shuttles, rotating said member so as to remove thefirst-mentioned type shuttle from the printing point and substitute thesecond shuttle, and lowering said member from engagement with saidshuttles.

11. In a typewriting machine having a keyboard, the combination of afixed anvil having a cylindrical surface, a type shuttle slidablymounted on said surface for oscillatory movement past a common printingpoint, means for indexing said shuttle to present characters at theprinting point, a second type shuttle slidably mounted on said anvilsurface, a member mounted beneath said shuttles, and means operable fromthe typewriter keyboard for raising said member into engagement withsaid shuttles, rotating said member so as to remove the first-mentionedtype shuttle from the printing point and substitute the second shuttle,and lowering said member from engagement with said shuttles.

12. In a typewriting machine, the combination of a fixed anvil having acylindrical surface, a first type shuttle slidably mounted on saidsurface for oscillatory movement past a common printing point, means forengaging the first shuttle and indexing it to present characters at theprinting point, a second type shuttle slidably mounted on said anvilsurface circumferentially of the first shuttle, and means operable fromthe typewriter keyboard for displacing the shuttle-indexing means fromengagement with the first shuttle, transposing the shuttles and engagingthe shuttle-indcxing means with the second shuttle.

13. In a typewriting machine, the combination of a fixed anvil having acylindrical surface, a first type shuttle slidably mounted on saidsurface for oscillatory movement past a common printing point, means forengaging the first shuttle and indexing it to present characters at theprinting point, a second type shuttle slidably mounted on said anvilsurface circumferentially of the first shuttle, a shuttle-transposingmember extending adjacent both shuttles, and means operable from thetypewriter keyboard for displacing the shuttle-indexing means fromengagement with the first shuttle, engaging the shuttle-transposingmember with both shuttles, operating the shuttle-transposing member totranspose the shuttles, disengaging the shuttle 11' transpo'sing memberfrom the second shuttle and engaging the shuttle-indexing meanstherewith.

14. In a typewriting machine, the combination of an anvil having acylindrical surface, a first type shuttle slidably mounted on saidsurface for oscillatory movement past a common printing point, means toindex the first type shuttle for presenting selected characters at theprinting point, a second type shuttle slidably mounted on said anvilsurface circumferentially of the first shuttle, a shuttle-shifting keyon the typewriter keyboard, and means operated by depression of theshuttle-shifting key for freeing the first shuttle from the indexingmeans, transpos- 15 ing the shuttles and engaging the second shuttlewith the indexing means and upon release of the shuttle-shifting key foreffecting reverse 12 action so as to restore the first shuttle tooperation at the printing point.

CHARLES W. NORTON.

JOHN H. RITZ.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS 0 Number Name Date 682,759 Sears Sept. 17, 19 1707,548 Campbell Aug. 26, 1902 710,089 Williams Sept. 30, 1902 794,851Campbell July 18, 1905 860,876 Lord July 23, 1907 1,056,159 EmeliantzeffMar. 18, 1913 1,093,575 Lopez Apr. 14, 1914

